[![enter image description here][1]][1]

  [1]: https://i.sstatic.net/3FH24.png

There are two cases:

1. When the two forces say L (for left) and R (for right) are equal. F=L=R
   What will be the reading?
   I know the reading would be F but why?

2. When the two forces are unequal that is L (not equal to) R
   What will be the reading?
   Well I have no clue;

Please help.